Adds locks for CommandBufferProxyImpl invalidation

media/gpu/ipc/client/gpu_video_decode_accelerator_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/gpu/ipc/client/gpu_video_decode_accelerator_host.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_utils.h"
+#include "media/base/bind_to_current_loop.h"

[danakj, 2017/01/13 19:32:04]

unused then

[emircan, 2017/01/13 19:41:09]

Sorry i missed out. Removing.

 #include "media/gpu/ipc/common/media_messages.h"
 
 namespace media {
 
 GpuVideoDecodeAcceleratorHost::GpuVideoDecodeAcceleratorHost(
     gpu::CommandBufferProxyImpl* impl)
     : channel_(impl->channel()),
       decoder_route_id_(MSG_ROUTING_NONE),
-      client_(NULL),
+      client_(nullptr),
       impl_(impl),
+      task_runner_(base::ThreadTaskRunnerHandle::Get()),
       weak_this_factory_(this) {
   DCHECK(channel_);
   DCHECK(impl_);
   impl_->AddDeletionObserver(this);
 }
 
 GpuVideoDecodeAcceleratorHost::~GpuVideoDecodeAcceleratorHost() {
   DCHECK(CalledOnValidThread());
 
   if (channel_ && decoder_route_id_ != MSG_ROUTING_NONE)
     channel_->RemoveRoute(decoder_route_id_);
+
+  base::AutoLock lock(impl_lock_);
   if (impl_)
     impl_->RemoveDeletionObserver(this);
 }
 
 bool GpuVideoDecodeAcceleratorHost::OnMessageReceived(const IPC::Message& msg) {
   DCHECK(CalledOnValidThread());
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuVideoDecodeAcceleratorHost, msg)
     IPC_MESSAGE_HANDLER(AcceleratedVideoDecoderHostMsg_InitializationComplete,
                         OnInitializationComplete)
@@ skipping 15 matching lines @@
   // See OnNotifyError for why |this| mustn't be used after OnNotifyError might
   // have been called above.
   return handled;
 }
 
 void GpuVideoDecodeAcceleratorHost::OnChannelError() {
   DCHECK(CalledOnValidThread());
   if (channel_) {
     if (decoder_route_id_ != MSG_ROUTING_NONE)
       channel_->RemoveRoute(decoder_route_id_);
-    channel_ = NULL;
+    channel_ = nullptr;
   }
   DLOG(ERROR) << "OnChannelError()";
   PostNotifyError(PLATFORM_FAILURE);
 }
 
 bool GpuVideoDecodeAcceleratorHost::Initialize(const Config& config,
                                                Client* client) {
   DCHECK(CalledOnValidThread());
   client_ = client;
 
+  base::AutoLock lock(impl_lock_);
   if (!impl_)
     return false;
 
   int32_t route_id = channel_->GenerateRouteID();
   channel_->AddRoute(route_id, weak_this_factory_.GetWeakPtr());
 
   bool succeeded = false;
   Send(new GpuCommandBufferMsg_CreateVideoDecoder(impl_->route_id(), config,
                                                   route_id, &succeeded));
 
@@ skipping 76 matching lines @@
   if (!channel_)
     return;
   Send(
       new AcceleratedVideoDecoderMsg_SetSurface(decoder_route_id_, surface_id));
 }
 
 void GpuVideoDecodeAcceleratorHost::Destroy() {
   DCHECK(CalledOnValidThread());
   if (channel_)
     Send(new AcceleratedVideoDecoderMsg_Destroy(decoder_route_id_));
-  client_ = NULL;
+  client_ = nullptr;
   delete this;
 }
 
 void GpuVideoDecodeAcceleratorHost::OnWillDeleteImpl() {
-  DCHECK(CalledOnValidThread());
-  impl_ = NULL;
+  base::AutoLock lock(impl_lock_);
+  impl_ = nullptr;
 
   // The gpu::CommandBufferProxyImpl is going away; error out this VDA.
-  OnChannelError();
+  task_runner_->PostTask(
+      FROM_HERE, base::Bind(&GpuVideoDecodeAcceleratorHost::OnChannelError,
+                            weak_this_factory_.GetWeakPtr()));
 }
 
 void GpuVideoDecodeAcceleratorHost::PostNotifyError(Error error) {
   DCHECK(CalledOnValidThread());
   DVLOG(2) << "PostNotifyError(): error=" << error;
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  task_runner_->PostTask(
       FROM_HERE, base::Bind(&GpuVideoDecodeAcceleratorHost::OnNotifyError,
                             weak_this_factory_.GetWeakPtr(), error));
 }
 
 void GpuVideoDecodeAcceleratorHost::Send(IPC::Message* message) {
   DCHECK(CalledOnValidThread());
   uint32_t message_type = message->type();
   if (!channel_->Send(message)) {
     DLOG(ERROR) << "Send(" << message_type << ") failed";
     PostNotifyError(PLATFORM_FAILURE);
@@ skipping 69 matching lines @@
 }
 
 void GpuVideoDecodeAcceleratorHost::OnNotifyError(uint32_t error) {
   DCHECK(CalledOnValidThread());
   if (!client_)
     return;
   weak_this_factory_.InvalidateWeakPtrs();
 
   // Client::NotifyError() may Destroy() |this|, so calling it needs to be the
   // last thing done on this stack!
-  VideoDecodeAccelerator::Client* client = NULL;
+  VideoDecodeAccelerator::Client* client = nullptr;
   std::swap(client, client_);
   client->NotifyError(static_cast<VideoDecodeAccelerator::Error>(error));
 }
 
 }  // namespace media